Often referred to as long wave pass (LWP) and short wave pass (SWP) filters, edge filters provide a well-defined transition between reflecting and transmitting regions. Essentially a modified quarter-wave stack, the filters use interference effects rather than absorption to isolate their spectral bands. Because edge filters will shift shorter with an increase in the angle of incidence, they are a good choice for fine-tuning the cut-on/cut-off wavelength. With their durable, first-surface dielectric coatings, Andover’s edge filters are built to withstand the normal cleaning and handling required by any high-quality optical component.

About us

We are a leading European distributor of high-quality scientific instruments and components. We offer components and systems used in materials science, imaging, spectroscopy, photonics, nanotechnology and life science research. We were founded over 45 years ago and employ more than 140 dedicated staff across Europe.